Here is yet another trap in the Marshall Defense, one that I have pulled off many times. I learned of it from Lev Alburt's column in Chess Life. Some Marshall players vary from the normal 3...Nxd5 with 3...Qxd5?! After 4.Nc3, they usually continue with 4...Qa5 a la the Scandinavian Defense. (Note that after the better 4...Qd8, White should play 5.Nf3 rather than 5.e4?!, which allows Marshall's idea 5...e5!) After 4...Qa5, 5.Bd2! is strong, intending to follow up with e4 and Nd5, for example 5...Bf5?? 6.e4! Bg6 7.Nd5 and Black resigned in Steller-Reig, Stroebeck 1982. About 90% of my Internet opponents instead find 5...Qb6, forking White's b and d pawns, and after 6.Nf3! they dive in with 6...Qxb2?? 7.Rb1 Qa3 8.Nb5!, when the queen has no way to guard c7.